A new ligand 2,5-di(pyridin-4-yl)benzaldehyde (L) was synthesized by the reaction of pyridin-4-yl-boronic acid with 2,5-dibromobenzaldehyde. Two novel CdII coordination polymers, [CdL(BDC)]·DMF (1) and [CdL(BPDC)]·4H2O (2) (BDC = 1,4-benzenedicarboxylate, BPDC = 4,4’-biphenyldicarboxylate), have been constructed based on the mixed ligands of L and dicaboxylic acid via solvothermal synthesis, and characterized by IR, microanalysis, TGA, single and power X-ray diffraction, and their fluorescence properties were also investigated. 1 crystallizes in orthorhombic space group Pcca with a = 15.8236(3), b = 16.0038(3), c = 20.2207(3), V = 5120.64(16)3, Z = 8, Mr = 633.83, Dc = 1.644 g/cm3, F(000) = 2528, GOOF = 1.130, the final R = 0.0568 and wR = 0.1513 for 4108 observed reflections with I > 2σ(I). 2 crystallizes in orthorhombic space group Pbcn with a = 29.1148(1), b = 16.0120(6), c = 16.7097(7), V = 7789.8(5)3, Z = 8, Mr = 675.88, Dc = 1.153 g/cm3, F(000) = 2712, GOOF = 1.088, the final R = 0.0670 and wR = 0.1805 for 6047 observed reflections with I > 2σ(I). The dinuclear Cd2(CO2)4 unit is linked by BDC in 1 to form a 2D sheet that is further pillared by L to create a 3D metal-organic framework, which possesses a parallelogram channel with diagonal distances of ～13.3 × 17.6along the b direction. 2 is structurally similar to 1, but has larger diagonal distances of ～14.0 × 26.7  due to the elongated auxiliary ligand BPDC compared with the BDC ligand in 1. They are both thermally stable and exhibit strong photoluminescence in the visible region. A novel ligand 2,5-di (pyridin-4-yl) benzaldehyde (L) was synthesized by the reaction of pyridin-4-yl-boronic acid with 2,5-dibromobenzaldehyde. ) · DMF (1) and [CdL (BPDC) · 4H2O (2) (BDC = 1,4-benzenedicarboxylate, BPDC = 4,4’-biphenyldicarboxylate), have been constructed based on the mixed ligands of L and dicaboxylic acid via solvothermal synthesis, and characterized by IR, microanalysis, TGA, single and power X-ray diffraction, and their fluorescence properties were also investigated. 1 crystallizes in orthorhombic space group Pcca with a = 15.8236 (3), b = 16.0038 , C = 20.2207 (3) , V = 5120.64 (16) 3, Z = 8, Mr = 633.83, Dc = 1.644 g / cm3, F (000) = 2528, GOOF = 1.130, and wR = 0.1513 for 4108 observed reflections with I> 2σ (I). 2 crystallizes in orthorhombic space group Pbcn with a = 29.1148 (1), b = 16.0120 (6), c = 16.7097 (7) 5) 3, Z = 8, Mr = 675.88, Dc = 1.153 g / cm3, F (000) = 2712, GOOF = 1.088 , the final R = 0.0670 and wR = 0.1805 for 6047 observed reflections with I> 2σ (I). The dinuclear Cd2 (CO2) 4 unit is linked by BDC in 1 to form a 2D sheet that is further pillared by L to create a 3D metal-organic framework, which possesses a parallelogram channel with diagonal distances of ~ 13.3 × 17.6 along the b direction. 2 is structurally similar to 1, but has larger diagonal distances of ~ 14.0 × 26.7  due to the elongated auxiliary ligands BPDC compared with the BDC ligand in 1. They are both thermally stable and exhibit strong photoluminescence in the visible region.